I think allowing to maximize a certain UI-Element in your e4 on JavaFX application has been the most demanded features missing for e4 on JavaFX. e(fx)clipse 2.2.0 adds support to maximize an UI-Element as shown in the following video:

(Optional) Register an OSGi-Service of type org.eclipse.fx.ui.workbench.renderers.base.services.MaximizationTransitionService if you want some nice transitions, we ship a default transition as see in the above video named org.eclipse.fx.ui.workbench.renderers.fx.services.ProgressiveMaximizationTransitionService

I think this one coolest features we added since a long time and what makes it even cooler this support was contributed by one of the frameworks adopters Sun Volland.

If you are interested in other new features of 2.2.0 look at this overview page